Unbind default key binding for closing Emacs

Every so often, I accidentally close Emacs by confusing C-x and C-c.  To prevent
this, unbind the default key binding C-x C-c for closing Emacs.  Instead, we can
directly call `save-buffers-kill-emacs', what is what I am usually doing.

And, seriously, why should anyone close Emacs in the first place?

init.el

@@ -221,6 +221,7 @@
   (bind-key [insert] nil)
   (bind-key [kp-insert] nil)
   (bind-key [remap fill-paragraph] #'endless/fill-or-unfill)
+  (unbind-key "C-x C-c" global-map)
 
   ;; Overwrite certain keybindings only if packages are avilable